Mirid Bug
Lygus pratensis

Lygus pratensis is a European mirid bug resident in the southern part of the UK. It has an ivory-coloured heart ("scutellum" or shield) on its back.

The shoulder mantle ("pronotum") is variable, as shown here, and there are black-tipped white triangles at the end of the wing cases.

The legs and abdomen are light green. Nymphs (young) are red.

CAVEAT: There are several very similar bugs in the genera
Lygus, Orthops, Pinalitus, Monosynamma, Harpocera and others, with slight variations of abdomen/leg/thigh colour,
back pattern/colour, antennae segment lengths and other traits. My identification of the above as the common Lygus pratensis has not been verified by an expert. Similarly, other identifications of mirid bugs in the genera mentioned remain tentative.